﻿/**
* @author trixta
* @version 1.2
*/
(function ($) {

    var mwheelI = {
        pos: [-260, -260]
    },
	minDif = 3,
	doc = document,
	root = doc.documentElement,
	body = doc.body,
	longDelay, shortDelay
;

    function unsetPos() {
        if (this === mwheelI.elem) {
            mwheelI.pos = [-260, -260];
            mwheelI.elem = false;
            minDif = 3;
        }
    }

    $.event.special.mwheelIntent = {
        setup: function () {
            var jElm = $(this).bind('mousewheel', $.event.special.mwheelIntent.handler);
            if (this !== doc && this !== root && this !== body) {
                jElm.bind('mouseleave', unsetPos);
            }
            jElm = null;
            return true;
        },
        teardown: function () {
            $(this)
			.unbind('mousewheel', $.event.special.mwheelIntent.handler)
			.unbind('mouseleave', unsetPos)
		;
            return true;
        },
        handler: function (e, d) {
            var pos = [e.clientX, e.clientY];
            if (this === mwheelI.elem || Math.abs(mwheelI.pos[0] - pos[0]) > minDif || Math.abs(mwheelI.pos[1] - pos[1]) > minDif) {
                mwheelI.elem = this;
                mwheelI.pos = pos;
                minDif = 250;

                clearTimeout(shortDelay);
                shortDelay = setTimeout(function () {
                    minDif = 10;
                }, 200);
                clearTimeout(longDelay);
                longDelay = setTimeout(function () {
                    minDif = 3;
                }, 1500);
                e = $.extend({}, e, { type: 'mwheelIntent' });
                return ($.event.dispatch || $.event.handle).apply(this, arguments);
            }
        }
    };
    $.fn.extend({
        mwheelIntent: function (fn) {
            return fn ? this.bind("mwheelIntent", fn) : this.trigger("mwheelIntent");
        },

        unmwheelIntent: function (fn) {
            return this.unbind("mwheelIntent", fn);
        }
    });

    $(function () {
        body = doc.body;
        //assume that document is always scrollable, doesn't hurt if not
        $(doc).bind('mwheelIntent.mwheelIntentDefault', $.noop);
    });
})(jQuery);